This is a specialized Rally type, one not to be used on Trap accounts or anyone over 100m power, as there is No Hero in the Rally.
Port Bomb Basics
Your alliance has found a target with a good amount of troops, but they either have weak hero gear or are offline. Do not Port Bomb someone with anti-scout on, if they are reinforced you stand to lose a bunch of troops. Have your Rally leader start a rally Without a Hero in it. When the rally is 10 seconds away from marching, have the Rally Leader teleport next to the Target.
Critical Point: You cannot execute this maneuver if the Hero is in the rally.
Why A Port Bomb is Killer
This is a great way to surprise the enemy. You could even set this up over a period of time, by fake rallying on the enemy. When they become complacent about the rallies being set, that's when you can utilize "The Drive By". It is a Risk, but it allows your alliance to execute a rally from a long distance away.
You cannot port the rally if any of the peoples troops who are joining your rally have reached your city. The troops joining your rally have to be on their way in order be in the rally. So you set the rally (without your hero) while sitting away from the rest of your alliance (at least 5 minutes away), and then everyone joins. When the rally is 10 seconds from hitting, you port next to the enemy, all of the people’s troops that joined your rally enter all at once and the person you’re hitting never sees it coming.
Note from Navi: I can see this strategy being particularly useful against inexperienced new players in new kingdoms. Some of those players wait too long to build a strong hero or don't leave their hero skilled for attack which leaves them extremely weak. Also, they often will not turn on attack boosts until they know they are being attacked. All these factors leave them vulnerable. I am a little nervous to do this to a player who I've never attacked, but in non-ancient kingdoms you get to know how your enemies pretty quickly and learn whether or not they would be vulnerable to a Port Bomb.
Contributed by MOS ULTRA